Rotated my tires a few days ago. First chance I really had to look underneath the car ('16 LaCrosse). Motor is rated at 305NHP, 6 cylinder and direct fuel injection. The exhaust on this car is impressive even being of a catback type. Exits from the engine either side into a big single pipe, maybe 4"? Goes through a converter, resonator and resplits into dual exhaust and 2 pancake mufflers. Tips are integral with rear bumper fascia, doesn't look too bad aside from the muffler ends aren't attached (floating) and can see daylight here and there.

Have no photo of underside except for model lol, follows actual quite close. Think I've shown before. Not quite like other car with real dual exhaust, side pipes and straight through Corsas, oh well.

 

Actual photo of car, not mine but same difference. This car's supposed to be 444NHP with a U Code road runner engine (it's my same '13 Boss). Only think of these things to get or keep the ball bouncing. Resonators aren't dented, made that way.